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我正在使用 Jiql 连接到 GAE 上的数据存储，但是当我尝试打开数据库连接并执行查询时，出现以下错误。

问题是，是因为缺少 EntityNotFoundException 类还是因为缺少数据存储中的实体之一？由于我对此完全陌生，有人可以解释错误输出吗？

Starting Jetty on port 8888
   [WARN] Exception while dispatching incoming RPC call
com.google.gwt.user.server.rpc.UnexpectedException: Service method 'public abstract void com.baytex.zoopreel.client.services.StartupService.startSession()' threw an unexpected exception: java.lang.NoClassDefFoundError: com/google/appengine/api/datastore/EntityNotFoundException
    at com.google.gwt.user.server.rpc.RPC.encodeResponseForFailure(RPC.java:385)
    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:588)
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processCall(RemoteServiceServlet.java:208)
    at com.google.gwt.user.server.rpc.RemoteServiceServlet.processPost(RemoteServiceServlet.java:248)
    at com.google.gwt.user.server.rpc.AbstractRemoteServiceServlet.doPost(AbstractRemoteServiceServlet.java:62)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1097)
    at com.baytex.zoopreel.server.EncodingFilter.doFilter(EncodingFilter.java:28)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1088)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.handler.RequestLogHandler.handle(RequestLogHandler.java:49)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:324)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: java.lang.NoClassDefFoundError: com/google/appengine/api/datastore/EntityNotFoundException
    at org.jiql.jdbc.jiqlConnection.<init>(jiqlConnection.java:59)
    at org.jiql.jdbc.Driver.connect(Driver.java:89)
    at com.baytex.server.db.connector.PMF.get(PMF.java:31)
    at com.baytex.zoopreel.server.StartupServiceImpl.startSession(StartupServiceImpl.java:211)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at com.google.gwt.user.server.rpc.RPC.invokeAndEncodeResponse(RPC.java:569)
    ... 25 more
Caused by: java.lang.ClassNotFoundException: com.google.appengine.api.datastore.EntityNotFoundException
    at java.lang.ClassLoader.findClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at java.lang.ClassLoader.loadClass(Unknown Source)
    at org.mortbay.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:352)
    at org.mortbay.jetty.webapp.WebAppClassLoader.loadClass(WebAppClassLoader.java:337)
    ... 34 more
[ERROR] 500 - POST /zoopreelgwt/startup (localhost) 57 bytes
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2 回答 2

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这很可能是您问题的解决方案。

于 2012-06-13T08:09:30.827 回答
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Service method 'public abstract void 

com.baytex.zoopreel.client.services.StartupService.startSession()'

threw an unexpected exception: java.lang.NoClassDefFoundError

似乎是一个不错的起点，除此之外...如果您需要更好的帮助，请提供更多信息

于 2012-06-13T07:40:26.330 回答